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Modernization and the Presence of Mainframes

To understand the significant presence of mainframes, we must deep dive into how many lines of mainframe code really exist in the world. In the late 90s, there were several schools of thought that there were around 200 billion lines of COBOL code in around 10 Million applications with an investment of 5 trillion US dollars. Assuming that a million lines of new code could grow every year for the next few years (maintenance, bug fixes/compliance related changes), and another few (10-100) million lines of code being removed (after modernization), the equation would more or less remain the same and the maintainable code could still be in 100s of billions. Modernization is something that must happen at some point of time, and if they still exist as a backbone for many companies without being modernized in spite of many issues, we should realize why so. A few of the probable reasons why they still exist are listed:

Every year, mainframe systems:

Are responsible for transporting up to 72,000 shipping containers

Manage 75-85% of the world's business data

Handle data for 60+ million patients

Process 80% of point-of-sales transactions

Connect 500 million mobile phone users

CICS can handle more than 30 billion successful transactions each day worldwide

CICS programs process more than $1 trillion worth of business each week without any negative impact on the end customer

According to the survey conducted by Arcati in 2013, many of the responding organizations said they manage around 40-100% of their enterprise data on the mainframe

96 of the world’s top 100 banks, 23 of the 25 top US retailers, and 9 out of 10 of the world’s largest insurance companies run IBM System Z architecture.

71% of global Fortune 500 companies are System z clients.

90% of the top global life and health insurance providers process their high-volume transactions on a System Z mainframe